Scattering of exchange spin waves from a helimagnetic layer sandwiched between two semi-infinite ferromagnetic media
| Autor: | A. N. Kuchko, V. D. Poimanov, V. V. Kruglyak |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed matter physics Scattering 02 engineering and technology Polarizer 021001 nanoscience & nanotechnology 01 natural sciences law.invention Ferromagnetism Spin wave law Dispersion relation 0103 physical sciences Precession Reflection (physics) Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Anisotropy |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.102.104414 |
| Popis: | We have calculated the scattering (reflection and transmission) coefficients of linear exchange spin waves normally incident upon a helimagnetic layer sandwiched between two semi-infinite ferromagnetic media. Our calculations show that, despite the helimagnetic order induced in the layer by the Dzyaloshinskii-Moriya interaction (DMI), the scattering is reciprocal and insensitive to the presence of the helimagnetic order in the layer. This comes as a result of the disappearance of the DMI from the boundary conditions in the considered geometry under the small-amplitude approximation and from the specific form of the nonreciprocity of the spin-wave dispersion relation in the helimagnetic material. We show that the helimagnetic layer's interfaces act as a system of two semicrossed polarizers for the circularly polarized spin waves incident from the ferromagnetic media. This results from the ellipticity of the magnetic precession induced by the easy-plane anisotropy in the helimagnetic layer. Our calculations also reveal the importance of evanescent solutions to correctly describe the spin-wave scattering in samples with elliptical precession. Our findings will aid development of magnonic devices containing helimagnetic constituents. |
| Databáze: | OpenAIRE |
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